Add Support for CASE Expressions #761
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Previously the visitor rendered both the column and the condition, but this won't work for simple case statements. We need to be able to render only the condition for simple case statements.
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This PR adds support for both simple and searched case expressions. The Java and Kotlin DSL are updated to support CASE expressions in an idiomatic manner for this library.
This PR also adds CAST as a built in function as it is common to use CAST with CASE expressions.
Resolves #757